They are pointing at each other, that's the end of the detour actually. They want you to go down the other road.

See the story behind it is that there is a connecting road between these two streets, and that road is closed while they replace this bridge that goes over a creek. To help people they have detour signs pointing you to where the two streets meet so you can get to the other one.

But if you are just driving down the street, and don't look down the road that's closed, all you see are detour signs that point you to that location, where another detour sign from the other direction is pointed at the same location. It looks all kinds of wrong, especially since there's another connection road that's passed over that would have made a much better place to put the detour.

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If it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.